Platen-rotating means for type-writing machines.



` 0. THIEME. PLATEN ROTATING MEANS FOR TYPE WRITING MACHINES.

v ,APPLIOATION FILED SEPT. z3, 1910.

1,028,505.` l Patented June 4,1912.

'nnTTnn sTaTns raTnnT operon.

OTTO THIEME, F ST. LOUIS, MISSOURI, ASSIGNOR TO MOON-HOPKINS BILLINGMA.- UHINE COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

VltuTIECNZTOI'ATING MEANS FOIt TYPERITING MACHINES.

Thassos.

specification of Letters raient. p

Patented J une 4,1912.

- Application filed September 23, 1910. Serial No. 583,437.

. able others skilledin the art to which it appertains to malte and usethe same, reference being had `to the accompanying'draW- ings, formingpart of this specification, in which- Figure 1 is a generai plan view ofmy im proved device shown diagrammatically. Fig. 2 is an elevationalview. Figs. 3 and 4 are detail views. I

. This invention relates to improvements in the means forrotatingaplaten in a typewriting machine. K

Itis often necessary to double space the lines 'of print-ing on a sheetand my object has been to provide a simple device to be used inconnection with-the ordinary operatingmeans for a platen, whichdetermines as yto the spacing or amount of rotation of the platenbetween the lines oi the sheet to be printed.' This result may beaccomplished bly simply changing position of one of the e ements on themachine.

Referring to the drawings, 1 indicates gen erally the carriage of themachine, and 2 the end-'piece of the carriage having the usual platenjournaled therein. The platen is mounted on shaft e extending beyond thecarriage and having thes usual hand wheel 5 attached. Fixed on the shaft4 also inside the carriage is a ratchet wheel 6. Pivoted at 7 on a fixedpart of the carriage `is an arm 8 having a slot 9 in the body thereof,an overthrow stop or pawl 8a and a groove 10 in ytlm head for thereception of a pavvl member 'I 11. rThe pawi is pivoted to the arm 8 onthe stud 12, Aand has a tail piece 13 wit-ha spring 14 attached at oneend to the tail piece, and at the other to thearm 8. The pawl 11 has asharp pointed portion 15 at its end, and a fiat surface 16 connected by:an inclined portion 17 with another fiat straight portion 18 of thepaw-l.

Suitably mounted on the carriage is a fixed bracket 19 having a pinmember 2() projecting'from the upper end thereof with if, -shapednotches 21 and 22, in its periphery and opposite said notches a lattenedportion 23. 0n this pin member is mounted a sleeve 24 which has a studmember-'25 screwed therein to engage the flattened portion 23 of the pin20. Screwed into the periphery of the sleeve opposite the studf 25 isahand piece 2G internally bored for the reception of of pointed pin 27acted upon by an eX- pansive spring 28. 'By this construction the l,

hand member 2G is operated and the spring actuated pin 21 is pressed out'of position if it be in a notch'in the pin20 and the sleeve 24 canthereby be moved until 'the pin 27 drops into a second notch as, for eX-ample 22.

Iffor any reason it is desired to retain the sleeve member 24E` in anyfixed position the stud 25 may be screwed in to engage the flattenedportion 23 -of the pin 20. Proe jecting from one end of the sleeve 24isa pin member 29 upon which the paw1-11 rests. The 'sleeve 24 may beretained on the iXed bracket 19 in any suitable manner, as for example,the flattened portion 23 of the pin may be discontinued to be formed'ona small portion only or' the pin so that thestud 25 may have avportionadapted to-engage this notch or flattened portion of the pin as notedabove.

Pvoted atlBO on a bracket 31 of the carriage is a hand lever 32 with aprojecting' portion 33 engaging in the slot 9 in the lever 8. If desiredlthe pivoted pin 30 may be attached to a coil spring 84 which is alsofixed to the bracket 31 and tends to hold the arm 32 in position toprevent the pawl 11 from engaging the ratchet Wheel (i, The hand lever32 is positioned so as to be used not only to operate theplaten-feedingpawl,but is also to be used to return the carriage toright hand position. As thslevcr is constructed, it is iirst operated toactuate they more. in each operation o fthe lever. If,

however, the hand piece 26 be moved into the dotted line position in 4so that the spring actuated pin 21 engages the notch 22, the pin 29 kismoved forward or toward the ratchet Wheel and when the hand lever 32 isoperated the'inclined portion of y p soon as .in the other position.

paWl will not. strike this pin until later in the stroke of the lever14, and therefore, the point of the pawl 15 will not be lovvered'as Forthis reason the ratchet )vlieel Will be moved by the pavvl a lessdistance than in the former position ot' the parts, that is, say, adistance of one tootlr.I e

It is obvious that any number of otches 21 and 22 may be applied to thepcrfphery ot' the pin Q0 so that the amount eflmo've ment ot' theratchet-,and theretore, of the lplaten may be changed any ninnberoftimes,

The overthrow stop or pawl 8 u'pon the' completion ot a forwardmovement, of thc arm S is moved into eilgagel'nent with' one ot'the'notchcs of the ratchet wheel 5 where it acts as a stop to preventoverthrowing of the ratchet by the pawl l5.

I do not wish to be understood as limiting my invention to its use inconnection with the platen of a typewritingmachine, as it Will beequally as useful in many other constructions. f l I am fully aware thatchanges in the construction, arrangement and combination ot' elementsmay be made in my device without departing from thespirit of in ginvention,

the scope of which is indicated in the' accompanymg clalms.

I claim:

1. In a device of the character described,

a roller having a ratchet wheel attached and operating means lheretor,comprlsmg a palwl, a spring tending to move said pawl toward the ratchetwheehla pin supporting said pawl, a sleeve upon which said pin ismounted, and means for shitting the sleeve -to change the relation ofthe supporting pin to the pawl.

2. In a deviceof the character described, a roller having a ratchetwheel attached and operating means therefor, comprising a pawl, aspring-tending to move said pawl toward the ratchet Wheel, a pinsupporting said p'aWl, a-sleeve upon which said pin is mounted, meansfor shifting'the sleeve to change the relation of the supporting pin tothe 'pawl, and means on the sleeve for retaining the pin in adjustedposition.

3. Infa device of the` character described, a roller having a ratchetWheel attached, means for operating said ratchet Wheel comprising apvoted paWl, a pin supporting said paWl above the ratchet Wheel, asleeve member upon which said pin is fixed, a netched support for saidsleeve member, and

a spring actuated pin mounted in the sleeve member and adapted to engageeither of the notches in the support.

4. In a device of the characte1-described, a roller having a ratchetWheel attached, a vertically slotted lever, a spiingactuated pawlpivoted thereto adjacentl the ratchetwheel, van independent support forthe pavvl,

when said lever is swung to its limit in ad` vanced position, a pawlpivoted to said slotted lever above the ratchet wheel, and a hand leverengaging the slot in the slotted lever, said hand lever being mounted ona vertical pivot tio-move in a horizontal di` rection.

'i'.A In a device of the character described, a roller having a ratchetWheel attached, a vertical lever, a`pawl mounted uponsaid verticallever, an overthrow stop .carried by said vertical lever and adapted tocontact.

with said4 ratchet Wheel when said pawl is direction, an operating levermovable in la horizontal plane adapted to engage said vertical lever tooperate said parts, a-vertical pivot about which said 'operatingleveroscillates, and a coiled spring around said vertical pivot,substantially asdescribed.

. 8. In a device of the class described, a

-roller having a ratchet Wheel attached, op-

' moved to its limit of movement in a forward eratingmeansv thereforcomprising `a pawl Y having on its underside a straight portion and aninclined portion, a pin bearing on said straight portion to support saidpawl in position above the ratchet Wheel, a sprlng for maintaining saidstraight portion .1n contact with said-pi n, and means for osclllatingand positioning said pin to raise and lower the normal posltion'of saidpawl.

In testimony whereof I hereunto aiiix my signature in the resence of twowltnesses, this 12th day of 'eptember, 1910.

y v OTTO THIEME. Witnesses:

J. CLIFT, M. P. SMITH.

